DO NOT MERGE. Reduce the matrix for testing purposes

Author: SamBarker

.github/workflows/ci.yml

@@ -30,7 +30,7 @@ jobs:
     name: test_ci
     strategy:
       matrix:
-        java-version: [ 11, 17, 21 ]
+        java-version: [ 21 ]
     steps:
       - uses: actions/checkout@v2
       - name: Set up JDK ${{ matrix.java-version }}

flink-kubernetes-operator/pom.xml

@@ -39,7 +39,7 @@ under the License.
             --add-opens=java.base/java.util=ALL-UNNAMED
         </surefire.module.config>
         <!-- valid options can be checked at https://central.sonatype.com/search?q=kubernetes-httpclient- currently: okhttp, jdk, jetty, vertx -->
-        <fabric8.httpclinent.impl>vertx</fabric8.httpclinent.impl>
+        <fabric8.httpclinent.impl>okhttp</fabric8.httpclinent.impl>
     </properties>
 
     <dependencies>